Regulus is a complex star system with at least four members. The primary bluedwarfstar Regulus A forms a close binary pair with a companion star, thought to be a white dwarf. Around Regulus A and its companion, a second binary pair orbits at a distance of some 5,000 AU.

Regulus lies almost exactly on the Ecliptic, the apparent path
of the Sun through the sky. This means that, once each year, the Sun will
appear to pass directly in front of the star, an event which happens on or about the
22 August.